Perimeter with Missing Lengths

What is the perimeter of the following shape?

• 21 in

• 24 in

• 42 in

• 39 in

What is the perimeter of the following shape?

• 20 in

• 40 in

• 60 in

• 80 in

A triangle has a perimeter of 30 cm. Two of its sides are 10 cm and 8 cm. What is the length of the third side?

• 12 cm

• 10 cm

• 14 cm

• 15 cm

Match the following perimeters with the length of one side of the square.

• A square has a perimeter of 48 cm.

• 9 cm

• A square has a perimeter of 36 cm.

• 8 cm

• A square has a perimeter of 40 cm.

• 12 cm

• A square has a perimeter of 32 cm.

• 10 cm

A pentagon has four sides measuring 3 cm each. If the perimeter is 20 cm, the length of the fifth side is (a)  

• 8 cm

• 6 cm

• 5 cm

• 7 cm

A rectangle has a perimeter of 50 cm. If one side is 15 cm, what is the length of the other side?

• 10 cm

• 12 cm

• 15 cm

• 20 cm

A rectangle has a perimeter of 24 cm. If the length is 7 cm, what is the width?

• 5 cm

• 6 cm

• 4 cm

• 3 cm

A hexagon has five sides measuring 4 cm each. If the perimeter is 30 cm, what is the length of the sixth side?

• 5 cm

• 6 cm

• 4 cm

• 7 cm

Match the following rectangles with their perimeters.

• Length: 5 cm, Width: 4 cm

• 18 cm

• Length: 10 cm, Width: 5 cm

• 30 cm

• Length: 6 cm, Width: 4 cm

• 20 cm

• Length: 8 cm, Width: 5 cm

• 26 cm

Find the missing length: Perimeter= 28 inches

• 10 centimeters

• 8 inches

• 5 inches